A method and system are provided for adjusting power distribution to remote radio heads in a telecommunication network. Multiple buses are implemented in a configuration to individually distribute power to remote radio heads. Each bus is connected to a remote radio heads allowing the remote radio head to receive power on an individual basis and different from other remote radio heads. An eNodeB collects operational measurements from a cell site which are used to provide instructions to adjust the power to each bus and corresponding remote radio head.
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7. A system for adjusting power distribution to remote radio heads in a telecommunication network, comprising:
a power distribution unit operable to receive direct current (dc) power from a set of batteries or rectifier when there is a loss of alternating current (AC) power;
the power distribution unit transmits the dc power to a set of power buses where each power bus is connected to a unique remote radio head, wherein a set of remote radio heads are assigned to a cell site and each remote radio head covers a cell site sector for wireless transmission; and
the power distribution unit individually alters a portion of the dc power to each power bus in the set of power buses and causes a change in the portion of the dc power received at each unique remote radio head.
1. A method for adjusting power distribution to remote radio heads in a telecommunication network, comprising:
connecting each unique power bus to each remote radio head, wherein each remote radio head transmits in a sector in a cell site and is a member of a group of remote radio heads assigned to the cell site, and wherein each unique power bus is a member of a group of power buses;
connecting the group of power buses to a power distribution unit;
receiving direct current (dc) power into the group of power buses; and
changing the dc power to each unique power bus, where each unique power bus is respectively connected to each remote radio head, and wherein the dc power provided to a first remote radio head is different from the dc power provided to a second remote radio head.
12. A system for adjusting power distribution to remote radio heads in a telecommunication network, comprising:
a power bus connects to a remote radio head, wherein the remote radio head transmits in a sector in a cell site and is a member of a group of remote radio heads assigned to the cell site, and wherein the power bus is a member of a group of power buses;
the group of power buses connects to a power distribution unit and receives direct current (dc) power; and
the power bus receives a change in the dc power, wherein the power bus in the group of power buses is respectively connected to the remote radio head in the group of remote radio heads, and wherein the dc power provided to a first remote radio head is different from the dc power provided to a second remote radio head.
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Not applicable.
In the telecommunications environment in wireless networks, the average backup power is typically restricted to four (4) hours to be shared among equipment. This limited amount of time leaves no options for load shedding or distributing load to equipment that needs power the most. Currently, power is allocated equally through battery strings to remote radio heads (RRHs). Backup systems use a single direct current (DC) bus for power distribution to the remote radio heads. Equal power distribution is inefficient and causes a shortage in battery backup time for radios with higher capacity. Therefore, a solution is needed that would allow power to be distributed variably.
Embodiments of the invention are defined by the claims below, not this summary. A high-level overview of various aspects of embodiments of the invention is provided here for that reason, to provide an overview of the disclosure and to introduce a selection of concepts that are further described below in the detailed description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in isolation to determine the scope of the claimed subject matter.
Embodiments of the present invention relate generally to an adaptive allocation of battery backup power between remote radio heads by using multiple DC buses to enable variable power distribution. A feedback mechanism is incorporated to consider the existing battery backup power for each remote radio head and consider user equipment (i.e. mobile device) activity to decide on power requirement. With variable power distribution, radios having low battery backup, and a higher number of mobile devices can be dynamically assigned more battery capacity.
Illustrative embodiments of the present invention are described in detail below with reference to the included drawing figures, wherein:
Embodiments of the present invention relate generally to a method and system for adjusting power distribution to remote radio heads in a telecommunication network. Multiple power buses are incorporated to allow a variable power distribution to be provided to network elements. The power is changed based on a feedback mechanism that monitors power levels and power requirements. As the power needs change, signals can be sent from a network device such as an evolved node B (eNodeB) adjusting the power distribution to one or several buses causing a power change to one or several remote radio heads.
In a first aspect, a method for adjusting power distribution to remote radio heads in a telecommunication network is provided that includes connecting each unique power bus to each remote radio head. Each remote radio head transmits in a sector in a cell site and is a member of a group of remote radio heads assigned to the cell site. Each unique power bus is a member of a group of power buses. The group of power buses is connected to a power distribution unit. Direct current (DC) power is received into the group of power buses. The DC power is changed to each unique power bus. Each unique power bus is respectively connected to each remote radio head. The DC power provided to a first remote radio head is different from the DC power provided to a second remote radio head.
In another aspect, a system for adjusting power distribution to remote radio heads in a telecommunication network is provided that includes a power distribution unit that operates to receive direct current (DC) power from a set of batteries or rectifier when there is a loss of alternating current (AC) power. The power distribution unit transmits the DC power to a set of power buses. Each power bus is connected to a unique remote radio head. A set of remote radio heads are assigned to a cell site and each remote radio head covers a cell site sector for wireless transmission. The power distribution unit individually alters a portion of the DC power to each power bus in the set of power buses and causes a change in the portion of the DC power received at each unique remote radio head.
In
In
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In
In many configurations, the battery backup unit such as batteries 330 is configured with four battery strings and usually allow for four (4) hours of battery backup when AC power 310 is lost. These batteries provide 48 volts, and in some old systems, provide 24 volts. Likewise, in most situations, RRHs 360A, 360B, and 360C are the most power consuming devices in the cell site because RRHs 360A, 360B, and 360C are the most critical elements. They are responsible for the processing of signals during wireless transmissions. In most configurations, there is only one bus 350, which is involved in the distribution of power to RRHs 360A, 360B, and 360C. Note: Although power distribution unit 340 and bus 350 are shown as separate elements, in alternative embodiments, these two elements may be combined into one element or device. As a result, this single bus 350 is responsible for providing all the power to the remote radio heads.
Based on the power received at RRHs 360A, 360B, and 360C, cell site 370 shows a wireless transmission coverage indicated by sectors 370A, 370B, and 370C. Each remote radio head corresponds to each sector. As the power is distributed from bus 350 to RRHs 360A, 360B, and 360C, a typical cell site 370 might show an even distribution of wireless coverage among sectors 370A, 370B, and 370C based on the power output at RRHs 360A, 360B, and 360C. As shown in
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A value in having a variable power distribution allows for power to be distributed and used more efficiently despite a limited battery backup resource. So, even if a set of battery strings can only provide four (4) hours of battery power, the power can be distributed to devices or areas that have the most need. For example, sector 470A may have a large number of mobile devices and require a significant amount of power for wireless transmission and coverage. On the contrary, sector 470B may transmit in an area that has a physical obstructions that does not require a lot of power or can only handle a restricted number of mobile devices. As a result, the power that ordinarily would be sent to bus 450B and RRH 460B can be reduced. In turn, the power to bus 450A and RRH 460A can be increased. The four (4) hours of battery backup can be used more strategically and efficiently to satisfy user demand.
The individual power requirement to each bus is determined by a feedback mechanism. In an implementation of an embodiment of the present invention, an eNodeB collects operational measurements of the cell site. For example, the eNodeB can collect data on the number of remote radio connections that occur in each sector. The number of remote radio connections in sectors 470A, 470B, and 470C can have an impact on the power usage in each sector. RRHs must have the ability to communicate with mobile devices as well as extend coverage if necessary over a particular area. Further, the eNodeB can collect data on the number of access attempts made by mobile devices in a particular sector. If more mobile devices attempt to have an access in a particular sector, the eNodeB can send information to the power distribution unit 440 or bus 450A, 450B, or 450C to adjust the power to accommodate the mobile devices in the particular sector. Likewise, the eNodeB can send information to adjust the power needs to the RRHs based on the remote radio connections.
Even though the feedback mechanism was discussed for remote radio connections and access attempts, other embodiments can be implemented that take into account other operational metrics. Depending on the preference of a service provider, other metrics can be used to provide feedback to elements to enable the power output from batteries 430 to be distributed to buses 450A, 450B, and 450C. As an example, voltage float levels can be monitored and voltage/ampere measurements can be taken. Based on the voltage/ampere measurements, the required power can be distributed from the proper battery string using digital logic controls. In other words, although there are four (4) battery strings, a subset of battery strings can be used. Timers as well as digital logic can be used with a lookup voltage/ampere table to determine the amount of power required from a battery string. Based on the amount of power that is required, digital logic can be used to combine parallel battery strings to provide the power that is needed to accommodate the most mobile devices.
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Although not shown, many of the elements in
Many different arrangements of the various components depicted, as well as components not shown, are possible without departing from the spirit and scope of embodiments of the present invention. Embodiments of the present invention have been described with the intent to be illustrative rather than restrictive. Certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations and are contemplated to be within the scope of the claims.
Marupaduga, Sreekar, Mitchell, Jr., Eugene S., Somashekar, Sharath, Manchanda, Nitesh
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